Requirement is to have all erasers to enable the quest, but it is unavailable. https://www.hidden-street.net/ems/quest/a-revenge-on-gray-the-alien https://royals.ms/forum/threads/eraser-quest-guide.128860/ Also checked my quest Ludus Lake tab and did not find any such quest. Had no issue doing "An Immovable Sword", found the npc and was able to complete it. Tried relogging, redropping and picking up, rearranging the erasers to the front of etc. Doesnt seem to work
You need to have also completed pre-requisite quests: Trading with Alien Gray (Level 44 and above) and The Effort to Make-Up (Level 44 and above)
DAMN IT. I only did the first prequest. I saw the new quest and thought nah maybe not linked... Alright thank you so much matt!
